how do tou add decimals?
http://www.mathsisfun.com/adding-decimals.html
you line the decimals up and then you lust add like you would with regular numbers
To add decimals, follow these steps:
1. Write down the numbers one below the other, aligning the decimal points.
2. If there are any missing digits after the decimal point, add zeros as necessary.
3. Start from the right-most column (the ones place) and add the digits in that column together.
4. If the sum is 10 or greater, carry the tens digit to the next column on the left.
5. Continue this process for each column, adding any carried digits and the next column's digits together.
6. Once you have added all the columns, write down the sum and place a decimal point in the same position as the original decimals.
7. If needed, round the resulting sum to the desired number of decimal places.
Here's an example:
Let's add 3.14 and 1.23.
3.14
+ 1.23
_______
Start from the right-most column:
4 + 3 = 7 (no carrying needed)
Now move to the next column:
1 + 2 = 3 (no carrying needed)
Finally, move to the next column:
Carry the 1 from the previous step: 1 + 1 = 2
The final sum is 4.37.